Electric-circuit-controlling appliance



April 22, 1930. J. SACHS ELECTRIC CIRCUIT CONTROLLING APPLIANCE Filed Ma.rch.9, 1927 2 Sheets-Sheet 1' Il /I l l 1/ [/1 l I I x 1/ A fnyentar Jasagalz 5}]75 51 11 2 4 arng/ April 22, 1930. J. SACHS 1,755,366

ELECTRIC CIRCUIT CONTROLLING APPLIANCE Filed March 9, 1927 2 Sheets-Sheet 2 Q F '49; j

'I ETKE w %W iii 927502" 47 5b 0555/] hit/75 i' ii {465% A rng/ Patented Apr. 22, 1930 aosarn sacrrs, or wEsr HARTFORD, commc'rrcur ELECTBIC-GII BIGUIT-UONTROLLING APPLIANCE Application fled Irma a, 1927. Serial No. 178.979.

The-invention relates to a circuit controlling appliance comprising abase spaced from a rear supportin wall and also comprismg a switching device ocated between the su porting wall and the plane of a rearward acmg surface of the base and preferably including.

a sliding member movable pa'rallelly with the su porting wall and located at least in part behind the said base. The invention is particularly applicable to an appliance of. the type descrlbed wherein fuse .contacts are mounted on the base, at least one of them being connected with a correspondingcontact of "the switching device. A construction embodying the present invention is similar in some respects to that disclosed in my copending application for electric circuit controlling appliance, Serial No.153,966filed December '10, 1926, and it is similar in other respects to that disclosed in my copending application for electric circuit controlling appliance, Serial No. 165,645, filed February 3, 1927. An appliance embodying the invention set forth in application Serial No. 153,966 has the fuse contacts arranged at the front of the base and it has the switch contacts arranged preferably at the back thereof and directly carried thereby. An appliance embodying the invention set .forth in application Serial No. 165,645 has the fuse, contacts at the front of the base and it has the switch contacts preferably at the rear of the base, but so connected with the rear supporting wall that the base with the fuse contacts thereon can be removed, leaving the switch'oontacts undisturbed and supported-on the said wall.

The general 0 ject of the present invention is to provide a fused switch having certain features of-the fused .switches disclosed in thesaid applications, but having the said features combined to produce new and advantageous results. An aplpliance embody-- ing the present invention switch contacts carried directly by the base as in application, Serial No. 153,966 and it has the other'switch contacts supported on the rear supporting wall as in application,

' Serial No. 165,645.

' When, as preferred, the switch comprises four separate switch contacts with a slidable as some of the switching member associated therewith, the two switch contacts which are electrically connectible respectively with the fuse contacts are carried by the fuse base to be removable therewith and the switch contacts which are connectible with the circuit wiresare carriedby the rear support so*- as to remain in fixed positions when the fuse base is removed. It will be observed that with this arrangement there is the advantage that detachable, electrical connections, are minimized, the base being removable to provide access to the switch without detaching any wires. In the construction shown in application Serial No. 153,966, the circuit wires had to be disconnected from their terminals in order to permitthe entire appliance, including the switch, to be removed; and in the construction shown in application Serial No. 165,645, the electrical connections between the fuse contacts and the corresponding switch contacts have to be broken in order to permitthe'base with the fuse contacts to be removed. This, breaking of electrical connections is entirely avoided in the present construction as the switch contacts connected with the-fuse contacts are more readily accessible for cleaning or adjustment. Obviously the contacts carried by the base are entirely exposed when the base is removed and the removal of the said contacts provides additional space facilitating the cleaning or adjustment of the re-' maining contacts.

Other and more specific objects of the invention will be apparent from the following specifications and claims.

In the accompanying shown'one embodiment of the invention, together with certain possible variations thereof, but it will be understood that the drawdrawings, I have I ings are intended for illustrative purposes only and are not ,to be construed as defining or limiting the scope of the invention, the claims forming a part of this specification willbe .type. x

being relied upon for that purpose. It will be particularly understood at the construction may be varied by substituting therein the alternate details of construction which are fully shown in the copending applications already referred to.

Of the drawings:

Figure 1 is a fra mentary front view of a fused switch embodying the invention, onehalf of the fuse block to ether with the corresponding fuse contacts eing omitted inorder that the switch construction may be more clearly shown. E

Fig. 2 is a bottom View of the parts shown in Fig. 1, the enclosing-cabinet being shown in section. o v

Fig. 3 is a sectional view taken-along the line 3-3 of Fig. -1.

Fig. 4 is a fragmentary sectional view similar to Fig. 3, but showing an alternate means of connection between the 'fuse block and the supporting elements therefor.

Fig. 5 is a perspective view illustrating the removability of the base and associated parts and also of the movable element of the switch.

Fig. 6 is a fragmentary view similar to Fig; 1, but showingan alternate supporting means for the fuse block.

Fig. 7 is a fra mentary sectional View taken along the lines -7 of Fig. 6.

As shown in the drawings, there are two pairs of fuse contacts and" two separate switchin devices, but it will be understood; is not limited to any par-" thatthe invention ticular number of. fuses and switches. The fuse and switch contacts are shown as symmetrically ,disposed with respect to the vertical central plane of the appliance and for the sake of convenience and simplicity of description, I will describe in detail only those parts at one side of the said plane, it being understood that the parts on the other side are, or may be, the same in construction eitcept for reversal of ositions.

Asshown 1n the rawmgs, there is a base 1 which is supported in fixed spaced relation witha rear support.

When there is an enclosing cabinet, this support may be the rear wall 0 the cabinet. Preferably fuse contacts such as 2 and 3' are provided, these'bein mounted on the base 1' at the front thereo These fuse contacts are shown as adapted for receiving a cartridge enclosed fuse F, but it understood that the invention is not limited for'use In addition to the main rear su port, which as stated may be the rear wall of the cabinet, I refer to also provide. an independent insu ating supporting device which is ordinarily, secured to the main rear su port but which is nevertheless separate there I ojm. This supdeviceis shown at 4 in the drawings and it may comprise asin 1e block, bar or plate of insulating materiaf.

with fuses of this particular.

Suitable means are holding the base in the aforesaid fixed spaced relation with the rear support. Preferably, this means is in the form of a plurality of supporting elements which are connected at their forward portions with the base and at their rear portions with the main r'ear support, preferably indirectly by means of the separate supporting device 4. The elements therefore serve to support the base in the described relationship with the said rear support. These same elements may also serve to .support the fixed or non-removable switch contacts, but as to this feature I do not'nece'ssarily limit myself.

As'shown in Figs. 1 to 3, there are four 1 porting elements and other associated parts constituting a unit which can, if desired, be secured to or removed from the rear support irl lithout disturbing their-assembled relations 1 I ocated in the space behind a vertical plane extending through the rear parts of the base 1 is a switch ng device. As concerns the broader phase of the invention, the type of switching device may be varied, but

preferably the switching device comprises two or more normally stationary switch con-.

tacts and a switching element which is reetilinearly phases of the invention, atleast one of the said switch contacts is mounted directly upon and electrically connected with one of the supporting elements 5 or 6. Preferably and as shown, two switch contacts. 9 and 10 at provided for normally movable substantially parallelly I with the aforesaid vertical plane and with the r eachjside are mounted upon'and electrically connected with the corresponding supporting elements 5 and 6. The contacts are preferably ofa resilient generally U-shaped form as' shown. Connected with the supportin elements 5' and 6 and thus connected wit% the switch contacts 9 and 10 are wire connecting terminals 11 and 12 each adapted for the connection of either an incoming circuit wire or an outgoin circuit wire. shown terminals of t e solder lug type but I do not so limit myself. I v i I have .14, these being carried solely upon the base l at the rear thereof and being electrically connected respectively with the fuse contacts 2 and 3. As-shown, each of the said supporting elements is held in place by means of a J is in the on position, as shown in Fig. 1, a circuit Wlll be established from the. wirescrew 17. The screw 17 may also serve as a means of electrical connection between the corresponding fuse'and switch contact, but

other connecting means may be employed if desired.

For establishing or breaking electrical connection between the switch contacts of the said pairs-9, 13 and 10, 14, I provide for each pair aswitching element which is rectilinearly movable: substantially parallelly with the front face of the supporting device and with the rear face-of the fuse base. When there are two pairs of stationary switch contacts there are two conducting switching elements 18 and 19 insulated from each other and adapted respectively to engage and disengage the said normally stationary switchcontacts. The two conducting switching elements 18 and 19 are preferably carried by an insulating element 20, which withthe said conducting elements constitutes a rectilinearly movable switching member. The insulating element 20 is preferably in the form of a flat plate, the said conducting elements 18 and 19 extending through it and projecting somewhat beyond the opposed surfaces thereof as shown. The details of the switching member ma be .as

. shown in my said copending application, Se-

rial No. 153,966., When the stationary switch contacts are located as shown, 'the sa1d flat insulating element 20 'is arranged perpendicularly to the supporting device and to the fuse base. The said elementmay extend 1nto grooves 21 and 22 formed in the said supporting device and in the said fuse base respectively. a

From the foregoing description, it will be apparent that when the switching member connecting terminal 11 through the contact supportlng element and the switch contacts 9, 18 and 13, to the supporting element and.

thence to the fuse contact 2. Similarly a connection is established from the fuse conto the contact supporting element 6 and the wire connecting terminal -12. When the switching member is moved upward from the position shown in .Fig.. 1,, the elements 18 and19'will be disengaged from the stationary switch contacts and circuit will be broken at two points at each side of the fuse," thus ,making a total of four breaks.

The insulatingelemrent of the switching member serves not only as a..carrier for the contacts 18 and 19, but it also serves as a barrier which is moved between the opposite stationary contacts immediately upon the disengagement of the corresponding movable contact 18 or 19 therefrom. Althou h the switching member is guided between t e supporting device 4 and the base'land is held by theseparts against forward or backward movement, it-is entirely free to adjust itself laterally to conform to the positions of the several stationary switch contacts. fi If'there are any defects inthe initial construction or mounting of these stationary contacts or in the subsequent adjustment thereof, the switching member will conform thereto and will at all times effect firm engagement with the contacts and will establish effective electrical connections therewith.

When there are two switching devices as shown and described, there is preferably provided an insulating baflie plate 23 located between them. This is shown as beingheld in slots in the supporting device an'd irrthe fuse base.

(It will beenoted that I have shown the stationary switch contacts as located respectivel be ond the. top and bottom edges of the use ase, so as to be readily accessible from the front.- The supporting elements 5 and 6 extend downward and upward from the fuse base and then extend rearward, and the contact supporting elements 15 and 16 ar e similarly constructed and located. The

location of the said contacts above and below the fuse base leaves them exposed for'convenient inspection and cleaning without the necessity for disassembling any parts of the appliance. Recesses. 24, 24 may be provided in the edges of the fuse base 1 to facilitate inspection and cleaning. .The stationary switch contacts are connected with the corresponding supporting elements by means of screws 25, 25 to permit the contacts to be easily removed for replacement, if necessary.

While I do not herein narrowly limit myself as concerns the locations of the stationary switch contacts in the direction of movement of the movable switching member, it will be observed that the said contacts are nevertheless preferablylocated behind the plane of a rearward facing surface of the base. It .will also be observed that the switching device as a whole is so located that at least a part of the movable memberthereof is directly behind the base.

The appliance is preferably enclosed in a cabinet, a part of a suitable cabinet being shown. The cabinet has a rear wall 26, side walls 27, 27 and anopenable front cover 28.

The supporting device may be secured to the rear'wall 26 by means of screws .29, 29.

The cabinet may be utilized as a means for the pivot sections. The crank section is op.-'

eratively connected with the movable switch member.

I provide'a suitable operative connecting means between theswinging cranksection 34 and each of the rectilinearly movable switch- Preferably this connecting ing members.

ermlt the asmeans is so constructed as to sembly or disassembly of the insulating ele-' ment with or from the operating means and theecabinet by simply moving the insulating element rearward or forward. For this purpose, I have shown in each insulating element 20 a slot 35 adapted to receive the crank section 34. The slot 35 is preferably open at one end, that is, at the back end, so as to fa cilitate assembly or disassembly as described.

, From the foregoing description, it will be obvious that by moving the handle 33 each of the switch members can be moved longitudinall upward or downward, as desired. With the andle 33 in its uppermost position, the switching members will be held in their lowermost posit-ions as shown in Figs. 1 and 3,

thus completing the circuit through the appliance. When the handle 33is moved to its lower position, the switching members will moved to their upper positions, thus sepa rating the movable contacts 18 and 19 from- -the stationary contacts 9, 13 and 10, 14 respectively and thus breaking each leg of the circuit at four points as already fully dcscribed.

I to avoid any possible s ort circuits.

The slot 35 is shown as being near the middle of the insulating element, this location jbeingordinarily preferable, but it willbe understood that I do not herein limit myself to this location. The baflle plate 23 is provided with an openin 23 to provide clearance for the crank section 34 of the operating spindle.

When it is desired to place the crank section 34 of the operating spindle very close to the contacts, the said crank section may be surrounded by insulatin materialin order This insulating material may vary as .to details, but I have shown a round tube 36 which may be longitudinally split along one side in order to permit its assembly along the spindle. It will be understood that the'slot 35 is wide enough to receive not only the crank sect-ion of the spindle but also the tube 36 on the said section. I do not herein claim the switch the fuses an the entire appliance, all of the parts thereof remaining in their normal relationship when the cover is opened. This is in contrast with earlier proposed appliances having parts mounted upon the cover so that access to the appliance could be had' only by moving the said arts on the cover out of their normal relationship with the remaining parts.

It is usuall referable to permit access to d f use contacts when the main cabinet cover is closed and Sealed, and for this purpose the said cover is shown as being provided with an opening 37 through which the said fuses and contacts are accessible. The relationship between the cover and fuse base 1 is such that the base serves to entirely close the said opening when the cover is in closed position. As shown, the cover is flat and is provided with a depressed portion 38 which, terminates at the said open1ng'37 and the base 1 is provided with an extension 39 which surrounds.v the fuse contacts and fuses and which engages or approximately engages with the cover depress1on'38 when the cover is in closed position.- Preferably, a part of the extension 39 projects through the opening 37 so as to positively prevent the insertion of wires or other conductors through the opening into engagement with live parts within the cabinet.

cover for the opening 37 and the parts are so Preferably there is provided an auxiliary constructed that the fuse cover cannot be opened when the switch handle 33 is in the position corresponding to the closed position of the switch and so that the handle 33 cannot be moved to the position corresponding to theclosed position of the switch when the cover is open. I have shown a sidewise opening flat cover 40 for the fuses, this cover preferabl directlyengaging the main cover 28 for slid ing movement thereon. Rigidly secured to the main cover 28 is a sheet metal guide 41 havin an opening 42 therein which registers with t e opening 37 in the main cover. j The guide 41 is spaced from. the main cover so that the fuse cover 40 is slidably mounted between the said parts. The said fusecover 40-is provided with a knob 42 which serves as a means for moving the fuse cover and which also serves as a stop for limiting the movement of the said cover in either direction. Fig.2

shows the cover 40 in its left hand closed position. It will be observed that when the fuse cover is in closed position and the switch handle 33 in the switch closing position, the said handle directly obstructs the cover and prevents the opening movement thereof. When the fusecover 1s in its open position having been moved to the right from the po sition shown in Fig. 2,.the said cover directly obstructsthe handle 33 and prevents its movement to switch closing'position. The specific construction and the interrelationship as herein described between asidewise opening cover and a switch operating handle are not claimed as part of the present inyention, these being set forth in my patents'for enclosed 'fused switches, Nos. 1,721,493, 1,721,494 and 1,721,495, all issued July 16, 1929.

The base 1 has been described as connected with the supporting elements therefor these elements as shown in Figs. 1 to 3 being the supporting elements 5, 5 and 6, 6. As concerns some of the broader phases of the invention, the base may be rigidly and permanently connected with these elements, but I prefer to detachably connect it so that it can be removed 'lar to from its normal position in order to permit free access to the switch ng device. As shown most clearly in Fig. 3, each-of the connectin elements 7 may be in the form of a screw an in this case the base may be disconnected from the supporting elements simply by unscrew-- ing the said screws In Fig; 4, I have shown a construction simit at I shown in Fig. 3, but differing in that the fuse base is so mounted that it may be readily removed b direct manual action and without the use 0 tools. Instead of pro viding means such as the screws 7 7 for holding the base in place, I have provided frictionally' acting resilient devices, of which one is shown at 7; Each of these enters an unthreaded hole in the corresponding supportingelement 5. The element 7 is in the form of'a screw which is held in place by a Illltg.

43, located in a recess 44 in the base. The rear end of the screw 7 is split as shown at 45 and it normally enters and engages the sides of an unthreaded hole formed in the corresponding supporting element. Thus, the elements 7 serve to frictionally" hold the base inplace without, however, forming an positive connection and thus leaving the ase free to be manually removed in a. forward direction.

a It maybe desirable to avoid the necessity f depending entirely upon the frictional engagement of theelements 7. with the corresponding supporting elements for holding the base in place. When elements such as 7 are used, I prefer to provide additional means normally serving to positively hold the fuse block against forward movement. When the cover of-thecabinet is constructed and arranged as already fully described, the cover serves as such a-means, the relationship between the base and the cover being the same as shown in Fig. 31 ,Thecover serves when closed to positivelyprevent removal of the vments for supporting both the fuse block, but nevertheless when open leaves the fuse block free to be readily removed as described. Y

Figure 5 illustratesvery clearly the remov- .port and remain electrically connected with the respectively correspondin circuit wires.

With the base 1 remove the slidable switching members 20 20 are no longer supported or held" at the front and are therefore free to be withdrawn in the forward dime tion. It will be understood that these switching members will ordinarily be'moved to the off position before being withdrawn; An

inspection of Fi 5 shows that when the base with its attache are removed, all ortions of the switch are freely accessible or inspection, cleaning or ad'ustment.

'5 also illustrates the fact that when switch contacts is removed and when the movable switch. member 20, 20

i the base with its contacts and also the sliding switching members are removed the remaining parts of the switching appliance can be easily assembled with or removed from the cabinetand the operating spindle. In

the initial assembling of the appliance the k operating handle is ordinarily put in piace in the cabinet before the switching mec anismis put in place. With the base, the sliding switching members and also the bafiie plate 23 removed, it is aneasy matterto insert the supporting device 4 with the attached parts 9 under the o crating spindle, the said supporting device Being first introduced in reversed position with the supporting elements 5, 5 or 6, 6 at one end hooked under the s indle.

'* Then the supporting device with t e attached parts is turned over and secured in place as shown bymeans of the screws 29, 29.

- I have shown and described supportin elements 5, 5.and'6,,6 for supporting the ase,

whichelements also serve to carry the switch contacts 9 and 10. I do not, however, limit myself to the useof the same supporting elease and the; switch contacts. In Figs. 6 and 7, I have shown separate supporting elements for these 4 purposes.

- As shown inthese figures there is an independent sup orting element 46 for the base 1, it being un erstood that two such/elements would ordinarily be used. Each element 43 comprises a metallic strip bent to the shape shown and suitabl secured to the supporting device 4, as or instance by means of screws 47, 47. Screws 29", 29 are shown forsecuring theentire appliance to the back wall of the cabinet. Thefuse base 1 is similar to that shown in- Figs. 1 to 5, but it is provided at each side with an extension 48 sufiiciently wide to engage the corresponding supporting element. This extension is connected with the supporting element by means,

of screws 49, 49, which may be removed to l permit removal .of the base.

I struction which may obviouslybe combined with those herein described. These features include interchangeable fuse blocks, a supporting device consisting of two parallel insulating bars instead of a single plate; an operating spindle arranged with its axis close to ,the rear wall instead of widely separated therefrom; and meter testing devices associated with the fuse switch and carried by the same rear supporting device. For the sake of simplicity, I have avoided showing these several features of construction in the present case, but it will be understood that they may be combined with the constructions herein shown.

What I claim is:

1. In an electric switch, the combination of a rear support, an insulating base mount: ed at the front of the support and in normally fixed spaced relationship therewith,

two stationary switch contacts located behind the plane of a rearward facing surface of the base and having parallel opposite contact faces substantially-perpendicular to the said surface, one of the said contacts being mounted upon the rear support independentl of the base and the other being mounted lrectly upon the base, and a rectilinearl movable switching member movable para lelly wlth the said rearward facing surface of the base and having opposite parallel contact faces which engage and disengage the two stationary contacts to. make and break the circuit through the switch.

2. In a fused switch appliance the comblnatlon of a rear support, an insu ating base mounted at the front of the support and in normally fixed spaced relationship therelwith, a pair of fuse receiving contacts on the ase, behind the facerof the base and having parallel opposite contact faces substantially perpendicular to the said surface, one of the said contacts be-" mg mounted upon the rear support indetwo stationary switch contacts located plane'of a rearward facing sur-- pendently of the base and the other being mounted directly upon the base, and electrically connected with one fuse contact, and a base and the support but connected therewith for supporting the formerin normally fixed space relation with the latter, a wire ter- 'minal connected with one of the said supporting elements, two stationary switch contacts located behind the plane of a rearward facing surface of the base with one of them mounted directly upon and electrically connected with the said base supporting element having the wire terminal connected therewith and with the other of them mounted directly upon the base independently of the said supporting elements and electrically connected with one fuse contact, a movable switching .element normally engaging the said stationary switch contacts to establish a circuit through the appliance, and means for moving the switching element to disengage it from or reengage it with at least one of the stationary switch contacts.

4:. In a fused switch appliance, the combination of a rear support, an insulating base, a pair of fuse receiving contacts mounted on the base, a plurality of elements of conducting material normally connected with the base for supporting it in spaced relation with the said rear support, two stationary switch contacts located behind the plane of a rearward facing surface of the base and having parallel opposite contact faces substan tially perpendlcular to thesaid rearward faeing surface'ofthe base, one of the said contacts being mounted directly upon and elec- -ments and electrically-connected with one fuse contact, a rectilinearly movable svv. inhingelement normally engaging the said; Itat'ionary switch contacts to establish a circuit through'the appliance, and means for rectilinear ymoving the switching element ap proximately parallelly with the rear faceof the base to disengage it from or reengage it with both of the stationary contacts.

5 In a fused switch appliance, the combi nation of a rear support, an insulating base, a pair of fuse receiving contacts mounted switching member comprising two conducting elements insulated from each other and each normally engaging the said switch contacts of the corresponding airs to establish avcircuit through the appliance, and means for rectilinearly moving the switching member approximately arallelly with the rear face of the base to disengage the conducting elem ents thereof from or re-engage them with all of the switch contacts.

6. In-a fused switch appliance, the combination of an insulating rear su portin device, an insulating base mounte at the ront of the rear su porting device and in normally fixed spaced relationship therewith, a pai pf fuse receivingcontacts onthe base, two stationary switch contacts located behind the plane of a rearward facing surface of the base and havin parallel opposite contact faces substantial y perpendicular to thesaid surface, one of the said contacts being mounted upon the rear support independently of the base and the other being mounted directly upon'th'e base and electrically connected.

with one fuse contact, and a rectilinearly movable switching member movable par-- allelly with the said rearward facing surface of the base and having opposite parallel contact faces which engage and disenga e the two stationary contacts to make and reak the circuit through the switch. I

7. In a fused-switch a pliance, the combination of an insulating base, a pair .of fuse receiving contacts mounted on the base, an

.insulating supporting device s aced rearward from the said base and a apted to be secured to a rear supporting wall, a plurality of supporting elements structurally separate from the base and the sup orting device but normally connected therewith for supporting the former in normally fixed spaced relation with the latter two stationary switch contacts-located' be ind the plane of a rearwardfacing surface of the base with one of them mounted upon a supporting device and with the other of them mounted directly upon the base'independently of the said supporting .device and electrically connected with one fuse contact, a rectilinearly movableswitching element normally engagin the said stationary switch contacts to esta lish a circuit through the appliance, and means for recti linear y moving the switching element approximately parallelly with the rear face of thebase to disengage it. from or re-engage it with both ofthe stationary switch. contacts.

8. In an electric switch, the combination .of a rear support, an insulating base, means for detachably and removably mounting the base on the support at the front thereof and in normally fixed spaced relationship therewith, two stationary switch contacts located behind the plane of a rearward facing sur-' face of the base and having parallel oppositecontact faces substantially perpendicular to the said surface, one of the said contacts being mounted 'upon the rear support independentl of the base and the other being mounted irectly upon the base so-as'to be remova ble therewith from the rear support, and arectilinearly movable switching member movableparallelly with the. said rearward facing surface of the base and diaving opposite parallel contact faces whichengage and disengage the two stationary contacts to make and break the circuit through the switch. 1

9. In an enclosed fused switch appliance, the combination of an enclosing-cabinet having an 0 enable front cover, an insulating base in t e cabinet, a pair of fuse receiving contacts on the base, means independent of the said cover for detachably and removably supporting the base within the'cabinet in normally fixed spaced relationship with the rear wall thereof, a stationary switch contact mounted upon the said rear wall, a second normally stationary switch contact mounted directly upon the base and removable therewith from the cabinet, a movable switching element normally enga 'ng the stationary switch contacts. to establish a circuit between them, and means for moving.

the switching element to disen age it from or re-engage it with both of 't e stationary switch contacts.

10. In an enclosed fused switch appliance,

the combination of an enclosing cabinet hav-.

ing an openable front cover, an insulating base in the cabinet,.a pair of fuse receiving contacts on the base, a plurality of supporting elements supplemental to the cabinet and to the base and permanently connected with the former, means independent of the cabinet:

cover for detachably and removably support-. ing the base upon the said supporting elements in normally fixed relationship with the said rear support, a stationary switch contact mounted upon the-rear wall of the cabinet, a

second normally stationary switch contact mounted directly'uponthe base and removable therewith from the cabinet, a movable switching element normally engaging the stationary switchc'ontacts to establish a cir} cuit between them, and means-for moving the switching element to disengage it from or re-en age it with both of switc contacts,-

the stationary 4o 1 1 switch contacts of the corresponding pairs 11. In an enclosed fused switch appliance, the combination of an enclosing cabinet having an openable front cover. an insulating base imgthe cabinet, a pair of fuse receiving contactsion the base, means independent of the said cover for detachably and removably supporting the base within the cabinet in normally fixed spaced relationship the rear wall thereof, a stationary switch contact mounted upon the said rear wall, a second proximately parallelly with the rear wall of the cabinet to disengage it from or re-engage it with both of the stationary switch contacts. 12. In a fused switch appliance, the comblnation of a rear support, an insulating base, a pair of fuse receiving contacts onthebase, a plurality of supporting elements supplemental to the support and to the base and permanentl connected with the former, means for detachably and removably supporting the base upon the said supporting elements in normally fixed spaced relationship'with the said rear support, two pairs-of 1 switch contacts located behind the plane of the rear face of the base with one contact of each pair mounted directly upon a correspondlng-base supporting element and with the other contact of each pair mounted directly .upon the base and removable therewith from the rear support, a rectilinearly movable switching member comprising two conducting elements insulated from each other and e'achnormally engaging the said to establish a circuit through the appliance, and means for rectilinearly moving the swltchmg member approximately parallelly with the rear face of the. baseto disengage the conducting elements thereof from or re- I engage them with all of the switch, contacts. I

13. In an electric switch, the combination of a rear support, an insulating base, means for detachably and removably mountin the base-on the support at the front thereof and n normally fixed spaced relationship therewith, two stationary switch contacts located behind the plane of a rearward facing surface of the base and having parallel opposite contact-faces substantially perpendicular to the .sald surface, one of the sa d contacts being mounted upon the rear support independently of the base and the other being mounted dlrectly'upon' the base, so as to be removable therewith from the rear support, a rectilinearly movable switching member movable parallelly with the said rearward facing surface of the base and having opposite parallel contact faces which engage and disengage the two stationary1 contacts to make and break the circuit t rou h the switch the said switching member eing normally uided at the front by the base, and means or rectilinearly moving the switching member, the said means being arranged to permit the free removal of the switching member in the forward direction when the base is removed.

14. In an enclosed fused switch appliance, the combination of an enclosing cabinet having an. openable front cover, an insulating base in the cabinet, a pair of fuse receiving contacts on thebase, means independent of the saidl -cover for detachably and removably supporting-the base within the cabinet inv of the cabinet to disengageit from or re-en-,

gage it with at least one of-the switch contacts, and means normally holding the movable switching element against forward movement with respect to the stationary contacts but adapted to ermit suchforward movement 'when the ase is removed.

15., In an enclosed fused switch appliance, the combination of an enclosing cabinet having an o enablefront cover, an insulat ng base in t e cabinet, a pair of fuse recelving contacts on the base, means independent of the said cover for detachably-and removably supportin normally xed spaced relationship. with the rear wall thereof,a stationary switch contact mounted upon the said rear wall, a second normally stationary switch contact mounted directly upon the base and removable thereand a conducting element carried thereby and normally engaging the stationary switch contacts to-establish a circuit between them and the said movable member engaging at its front with the said base and being freely removable from the cabinet and from the last said stationary contact when the base has been removed, and means for rectilinearly moving the switching member approximately parallelly with therear 'wall of the cabinet 'to disengage the conducting element thereof .from or re-arrange it with both of the switch 'contacts the last said means permitting forward removal of the switchmgmember as aforesaid. I

' JOSEPH SACHS.

the base within the cabinet in with from the cabinet, a rectilinearly mov- I able switching member, the said movable member comprising an insulating element CERTIFICATE-0i? GORREGTION.

Patent No. 1,755, 366. 'April 22, 1930.

, JOSEPH s 'cHsf It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2. line 102, for "phase" read phases; and page 8, line 125, claim 15, for "re-arrange" read re-engage; and that the said Letters Patent should be read with these egrrections therein that the same may conform to the record of the case in the" Patent Office. Signed and sealed this 15th day of January, A. D. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents.

Patent No. 1, 7 55, 366.

CERTIFICATE oi GORRECTION. v

. JOSEPH SACHS.

It is hereby certified that .error appears in the printed specification of the above numbered patent requiring correction -as follows: Page 2. line 1021,- for "phase" read phases; and page 8, line 125, claim 15, for "re-arrange" read re-engage; and that the said Letters Patent should be read with these cprrections therein that the same may conform to the record of the-case in the Patent Office.

Signed and sealed this 15m day of January, A. b. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

